If a user doesn't have a username "set" for an account, then the display_name field is omitted.
This is similar to a few other questions, but the only official answer says that "display_name should ...

I know that it's probably unintended that the Primary voting scores were leaked by the API, but I think if you're going to remove it, then at least make it official, so I won't have to wonder if it's ...

It looks like when I try to get the comments of a user that has "a huge number" of comments, I get a 500 error.
Jon Skeet's comments, 500 error: http://api.stackoverflow.com/1.0/users/22656/comments
...

Six to Eight's user display has just broken, as the /user/id/timeline route seems to have started returning different data. Previously, timeline_type of entries in the user_timelines array used to be ...

When I retrieve associated accounts for Joel Coehoorn using this query it only includes Programmers.SE and Webmasters.SE despite the fact that I retrieved the association key from a query to SU. The ...

the tag color for english site seem incorrect, the dark grey color is the background while the yellow colour is the foreground. This is contradictory to other sites which have the darker colours as ...

In looking into a StackFlair issue, I have discovered that MSO is not being returned as part of a user's associated accounts. Please see my associated accounts according to the api. Note that there ...

Not exactly sure how or why, but many times when I try and preview some URL, I get garbage. This has happened on several JSON preview websites as well as on my browser. Strangely this isn't all the ...

I am implementing a javascript client that uses the Flash based XHR replacement Flensed in the interest of providing more robust api communication than that provided by JSONP.
Apparently the current ...

the suggested_buffer_size of user.about_me is currently 3000.
it is apparent that this is the server-side field length.
the problem is that the text is stored server-side in markdown but when served ...

Update:
I am unable to reproduce the case of interactive browsing affecting app quota. And will concede that the failures that prompted this post were likely far edge cases.
The remaining issue of a ...

I have an app that resides on a server. It has only ever accessed the API from 2 IP addresses. The API key has not been shared and there is no client-side code.
When I go to /apps however, it says "5 ...

Altough the help/documentation lists 'todate' and 'fromdate' parameters for tags they do not work. This may be related to tags not having a creation_date. It would be great if we could filter tags by ...

Kevin, you fixed this bug some time ago, would you like to tag it as status-complete?
Sometime last week, this route stopped throwing 404 like the rest of my 'bad id' tests and started throwing 500. ...